Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a929570b94a925b…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 16:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7646f17e3ce8f7294cd7e6306fc83404 SHA-1: 71b841337a3e8897d54bc389a715945fc0d01ea8 SHA-256: 3a929570b94a925b876e160db012f513f0b15a2628652837806167c3f3e59eb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs are consistent with spearphishing attachments designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/uplcv?utm_term=adjectives+that+start+with+the+letter+o PDF link annotation
    • http://adas-muko.pl/photo/file/50350800044.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/luxuvifabavuxuw.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/fuzaxojizomeku.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/muguporutikofawubemi.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/gufoket.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0aed4957---sipuwamuwepulozimegoxiga.pdfIn PDF document text
    • https://curvy.tw/upload/files/24557141766.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/83237536570.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/zedisitalixobidepugofuw.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/83622852379.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/dexetokixuwetusowoworenil.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/65281242778.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/vimonaruzuwef.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/27366996570.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/bizumaze.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/gozolefubalinisu.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/jotizafo.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/21712028270.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/metos.pdfIn PDF document text
    • http://packamate.com/userfiles/27792158641.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/jepoliji.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/88028650045.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/bikonumisapijideg.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CB 10624 bytes
SHA-256: 31e5de6a570eb56f2a51f78a360877800c61f414c8b45585bc1e3c5bfadd05b5
font_02_sfnt_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 16936 bytes
SHA-256: 03b3a8588bb7040923958cedbcc4d64d5f75d5fbdd572313a2732e184cb50b84

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